Nanotechnology Final Exam Review 2/2

What is one reason that Moore's law is starting to break down?

• components are becoming so small they are nearing the size of a single atom

• nanoparticles are becoming more common

• there is not enough money to fund Moore's law

• a new concept regarding mesons makes it impossible to continue

What is the key reason that electron microscopes can see atoms, but light microscopes cannot?

• the wavelength of the electron beams are much larger than that of visible light and therefore can detect smaller items

• electron microscopes use quantum mechanics

• the wavelength of the electron beams are much smaller than that of visible light and therefore can detect smaller items

• electron microscopes use much more electricity and power enabling them to see smaller objects

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A scanning tunneling microscope uses

• a nanoscale sharp needle to tunnel through samples and the hardness gives the image

• a nanoscale sharp needed to scan over the surface of samples and the deflection of the needle gives the image

• a nanoscale sharp needle to thread through the sample

• a laser beam to scan across the surface of the object and record reflection data

The atomic force microscope can

• view nonconductive objects like DNA

• view only conductive materials like copper

• view only transparent objects

• view only nanoparticles

A crystalline structure is

• a material that is clear and shiny

• a material where the atoms are randomly arranged

• plastics and salt

• a material where atoms are positioned in a regular repetitive pattern

A unit cell is

• the smallest repetitive pattern in a crystal structure

• the smallest bacterial culture

• where we keep the most dangerous fugatives

• a unit of DNA that repeats throughout the genome

How would a MEMS device, which uses a cantilever, detect target molecules?

• by monitoring the frequency of oscillations

• by monitoring the length of the cantilever

• by the color of the cantilever

• by the thickness of the cantilever

Which MEMS device utilizes microfluidics?

• Pressure sensors

• Chemical sensors

• Inertial Sensors

• Transistors

Which MEMS devices senses a change in an object's inertia sometimes by utilizing a suspended mass.

• Pressure sensors

• Chemical sensors

• Intertial sensors

• Transistors

Photovoltaic cells have an efficiency well below 50%. Why is the efficiency so low?

• electrons react to photons in a limited wavelength range

• some energy from the photons is converted to heat

• some electrons do not flow through the wire to make electricity

• all of these answers

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